Low pressure tritium interaction with Inconel 625 and AISI 316 L stainless steel surfaces: An evaluation of the recombination and adsorption constants
The surface constants for the recombination sigma k(2) and adsorption sigma k(2) of tritium in Inconel 625 and austenitic stainless steel AISI 316 L have been determined from the measurements of tritium permeation through engineering components (bellows) typical of those used on large fusion devices that will operate with tritium. Experimental permeation measurements have been performed over the temperature range 450 K to 620 K and an interpretation of these data is attempted based on a surface limited tritium release model. In fact at the 0.1 Pa tritium partial pressure present in a machine such as JET, the flow of tritium is strongly influenced by surface reactions. Furthermore, it is often assumed that oxide layers, acting as permeation barriers, are present on such components. However, for effectiveness, such barriers must be intact and this may not necessarily be the case for engineering components where mechanical stresses can lead to oxide cracking. Recombination sigma k(2) and adsorption sigma k(2) constants of tritium were estimated both for stationary and continually flexing bellows.
Bibliographic Reference: Article: Fusion Engineering and Design
Record Number: 199610035 / Last updated on: 1996-02-16
Original language: en
Available languages: en